Sachusetts



May 18 1926.

S. M. BLANCH MEANS FOR HOLDING AND CENTERING GRINDING AND POLISHINGWHEELS OR THE LIKE Filed June 27, 1925 Patented May 18,1926.

SVEN MALCOLM BLANCH, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO FLEMINGMACHINE COMPANY, OF WORCESTER, SACHUSETTS.

MASSACHUSETTS, A CORPORATION OF MAS- MEANS FOR HOLDING AND CENTERINGGRINDING AND POLISHING WHEELS OR THE LIKE.

Application filed June 27, 1925. Serial No. 40,116.

this invention is all the wheels of the same size and having the samegrinding or polishing characteristics will be made alike and there willbe no difference in the central passage through them. This is doneaccording to the present invention by providing centering discs for suchwheels, all these discs being made to fit the wheels of all sizes andkinds and to support them, and the discs being constructed in setshaving different diameters of passages through them so that any wheelcan be put on any arbor merely by the selection of the right pair ofdiscs. These discs are formed of sheet metal at comparatively small costand as they vary only in the size of the passage through them for thearbor and as they can be used for all the various kinds of grinding andpolish,- ing wheels and discs, they do not involve any material expenseto the user and a large number of them does not have to be kept on hand.Even if that is done for safety the expense is very small and thestorage room required is also'very little. The trou ble of picking outfrom stock a wheel having the right sized hole is entirely avoided andthe discs are picked out with reference to that feature alone so thatthe difficulty of selecting them is reduced very materially.

Reference is to be had tothe accompanying drawings, in which- Fig.1 is aside View of .a grinding wheel fitted up with a pair of discs forcentering it on an arbor;

- Fig. 2 is a diametrical sectional view of the same on the'line 22 ofFig. 1; 1

Fig. 3 is a View similar to Fig. 2 of a' bufling wheel mounted on thearbor and ready for operation; and

Figs. 4 and 5 are diametrical sectional views of two of these discs ofdifferent. sizes.

The object of the invention has been explained in full and it issuflicient to say.

that the various grinding wheels 10 or cloth bufiing wheels 11 areproduced in the usual sizes and diameters and the former have a ring 12at the center having a passage through it larger than any arbor on whichthey are likely to be placed. The ring 12 can be made of any convenientmetal and a soft metal like. lead is preferred. These rings are allbored or turned out at the center to exactly the same internal diameterfor all shapes, sizes and kinds of stones, wheels and discs. In otherwords, all of them are made alike at the center so that if a user wishesto use a particular stone or wheel he does not have to pick through hisstock and find one with a rightcenter.

For, the urpose of centering these on arbors of di 'erent diameters, 1provide a set V of sheet metal discs 14 and 15. I have shown only two.of these but as many sizes of them are required as there are arbors ofdifferent diameters in any given shop on which these stones are to bemounted. Each disc is essentially fiat in the plane shown at the left ineach of Figs. 1 and 5 and each is provided with an annularprojection 16leaving a cylindrical shoulder 17. These shoulders 17 are ofexactly thesame diameter and size in all of the series of discs so that they willfit inside the rings 12 and 13 and accurately support them as shown in.Figs. 2 and Each disc is then curved backwardly into the main plane toform a circular flat surface 18 or 19 and then bent inwardly at thecenter to form a cylindrical wall 20 or 21. These cylindrical wallsconstitute bearings for the arbor A and they are made in differentdiameters on different discsfor the purpose of fitting the differentarbors.

It will be obvious that two of these discs turned end for end will gointo one of the rings 12 or 13, as shown in Figs. 2 and 3, and theirshoulders 17 will support these rings centrally and accurately. Thepassages through the two discs are of course of the same size andreceive this arbor and center the wheel just as well as if the passagewere formed in the wheel itself. After the parts are set up, as shown inFig. 2, they are put on the arbor A and secured in position in the usualway by collars 22 and 23 and a fastening nut 24, or in any other desiredmanner.

q grinding wheels having a certain fineness to .find one that will fitthe arbor, but he can pick up any wheel he finds having the dimensionsand characteristics that he desires and knows that will 0 on the arborto which he wishes to app y it. It will be obvious that when a man hasto find the wheel having a certain diameter and a certain thickness, andalso a certain fineness, and in addition has to find one with a passagethrough it of a certain diameter, it may involve the loss ofconsiderable time merely in searching for the right one, or else arather elaborate system has to be employed. Furthermore he has to keepon hand an unnecessarily large number of these wheels. Of course hekeeps in stock anyway wheels of the diameters, thicknesses andfinenesses that he desires but now with this invention he does not alsohave to keep four or five times as many of them as would be requiredmerely from the qualities mentioned. F urthermore, the selection of thediscs that are necessary is a very simple matter because they vary inone particular only. They also occupy very little space and their costis almost negligible. Although I have illus- 4 trated and described onlya single form of the invention and shown it as applied to only twowheels I am aware of the fact that it is capable of general applicationand also of modification by any person skilled in the art withoutdeparting from the scope of the invention as expressed in the claims.Therefore I do not wish to be limited in these respects but what I doclaim is l. The combination with a grinding or polishing wheel having acentral passage through it larger than the arbor on which it is to beplaced, of apair of sheet metal discs having shoulders fitting the innerwall of said passage and located opposite each other, each of said sheetmetal discs having a bearing at the center to fit the arbor on which thewheel is to be applied.

2. The combination with a grinding or polishing wheel having a centralring therein with a passage through it larger than the arbor on which itis to be placed, of a pair of sheet metal discs having circularshoulders near their circumferences fitting the inner wall of saidpassage and located opposite each other in the planes of the twoopposite fiat faces of the wheel, each of said sheet metal discs havingan integral hearing at the center to fit the particular arbor on whichthe wheel is to be applied.

3. As an article of manufacture, a sheet metal disc for the purposedescribed, comprising a flat circular plate having a cylindricalshoulder offset therefrom and having a definite dimension and providedwith a flat circular portion integral therewith extending from the innerend of the shoulder and provided with a second fiat portion nearer thecenter and ofiset from said fiat portion and in the plane of the mainportion of the disc and terminating in a cylindrical wall constituting ahearing.

In testimony whereof I have hereunto affixed my si nature.

S EN MALCOLM BLANCH.

